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Schedule II-Valuation and Qualifying Accounts (in thousands) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 2,233 $ 2,156 $ 85,161
Charged to Costs and Expenses 3,141   40
Charged to Other Accounts     (2,629)
Deductions (174) 77 (80,416)
Balance at End of Period 5,200 2,233 2,156
Allowance for doubtful accounts
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 468 512 438
Charged to Costs and Expenses 198   40
Charged to Other Accounts     34
Deductions (174) (44)  
Balance at End of Period 492 468 512
Valuation allowance in net deferred tax assets
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 1,765 1,644 84,723
Charged to Costs and Expenses 2,943    
Charged to Other Accounts     (2,663)
Deductions   121 (80,416)
Balance at End of Period $ 4,708 $ 1,765 $ 1,644